CN107112920B - Method for generating alternating current - Google Patents
Method for generating alternating current Download PDFInfo
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- CN107112920B CN107112920B CN201580051154.6A CN201580051154A CN107112920B CN 107112920 B CN107112920 B CN 107112920B CN 201580051154 A CN201580051154 A CN 201580051154A CN 107112920 B CN107112920 B CN 107112920B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
- F03D9/255—Wind motors characterised by the driven apparatus the apparatus being an electrical generator connected to electrical distribution networks; Arrangements therefor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
- H02K7/1807—Rotary generators
- H02K7/1823—Rotary generators structurally associated with turbines or similar engines
- H02K7/183—Rotary generators structurally associated with turbines or similar engines wherein the turbine is a wind turbine
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
- H02P9/107—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for limiting effects of overloads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
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Abstract
The present invention relates to one kind for generating alternating current (iG) method, described method includes following steps: generating multiple electron current (i1, i2, in), and by electron current (i1, i2, in) it is superimposed as total current (iG), wherein generating electron current (i using modulation method1, i2, in) in each electron current, modulation method use have tolerance limit (T1, T2) tolerance range method, and tolerance limit (T1, T2) it is variable.
Description
Technical field
The present invention relates to a kind of method for generating alternating current, the alternating current is for being fed into power supply network.
In addition, the present invention relates to a kind of corresponding feed-in equipment.The present invention also relates to a kind of wind energy facilities with this feed-in equipment.
Background technique
Especially for wind energy facility it is known that generating the alternation electricity for being fed into power supply network in the following way
Stream: multiple inverters generate electron current respectively, and these electron currents are superimposed as total current, and the total current of the superposition is presented
Enter into power grid.
This seed current is generated by means of modulation method, and the modulation method can also be referred to as pulsewidth modulation.It is this for generating
The basic method of alternating current is so-called triangular modulation.Here, saying with being slightly simplified, desired sinusoidal variations curve is given
It is superimposed sawtooth signal, it is then corresponding to each point of intersection closing or opening of desired sinusoidal variations curve in sawtooth signal
Semiconductor switch, to trigger or final voltage pulse.The method of the theme of this non-present invention simplifiedly can also be referred to as
For opened loop control, because preset sinusoidal signal and the sawtooth wave of superposition are all not based on the result of generation.
Another method is tolerance range method.Here, there are tolerance range around the SIN function for corresponding to desired electric current,
That is the lower limit of variation and upper deviation.Now, the output electric current of generation is detected and by it compared with the tolerance range.If electric current
Reach tolerance lower limit, then trigger switch pulse, and if the electric current detected reaches the tolerance range upper limit, the pulse
Terminate.Then, electric current changes in the tolerance range around preset, ideal sinusoidal variations curve.
The improvement of the quality of the electric current of generation is more particularly to by reducing tolerance range progress.I.e. if the band becomes more
It is narrow, then electric current correspondingly lesser extent changes around ideal sinusoidal variations curve and this generally also causes: switch
Frequency improves, because the electric current of generation quickly reaches the limit and then quickly trigger switch is dynamic due to the narrower limit
Make.
In this regard, the method is good known and also can be used in each height electricity for being then superimposed as total current
Stream.Then the total current generated in this way can be fed into power supply network.
By the superposition, electric current is substantially added at each moment, therefore the superposition is the adduction of these electron currents.
As a result, at the time of corresponding, the instantaneous value of electric current is added.It can also be obtained in the total current of superposition as a result, certain smooth
Change.This can be accomplished in that completely or partially to protrude multiple single electron currents corresponding with ideal sinusoidal
Overgauge and minus deviation.It is especially such when each overgauge and minus deviation are statistically uniformly distributed.However also can
Occur: the multiple overgauges or multiple minus deviation of each electron current are converged, and then obtain corresponding extra high total deviation.
In order to prevent this situation, each tolerance range can be made to be too narrow to respectively, so that each overgauge of each electron current
Theoretic addition is also no more than the expected maximum value for total current.
Yet it means that default especially narrow tolerance range, the tolerance range correspondingly cause extra high frequency.I.e.
If it is desired to this safety clearance is carried out in the case where 10 inverters for generating electron current respectively by this way and method,
So each tolerance range must be defined as 1/10th of following width: the width corresponds to the maximum allowable inclined of total current
Difference.Accordingly, it is possible to make the switching frequency of tenfold when modulating electric current.Therefore, consuming is huge, so as in this way and
The total current that method ensures to generate does not have excessive value.
Deutsche Bundespatent trademark office retrieves the following prior art: 40 23 207C1 of DE in the priority application of the application
And choosing is plucked in the written Power Electronics and Variable Speed Drives such as M.L ó pez
“Control design for parallel-connected DC-AC inverters using sliding mode
control”。
Summary of the invention
At least one of therefore, the purpose of the present invention is to, regarding to the issue above.It should especially propose following solutions:
The solution is avoided with as simple as possible and effective ways and means, total to export electric current and preset sinusoidal variations curve
Deviation is excessive.The solution of an alternative should be at least proposed relative to known solution up to now.
According to the present invention it is proposed that the method for generating alternating current.Described method includes following steps: generating multiple sons
Electric current and electron current is superimposed as total current.Each electron current is generated using modulation method, and the modulation method, which uses, has tolerance pole
The tolerance range method of limit.For this purpose, currently proposed, tolerance limit is variable.
I.e. therefore, the tolerance range of normal width can be used first.If present such as total current is more than desired upwards
Optimal sinusoidal variations curve, then such case can be resisted by following manner: for example reducing and be used for one, multiple or institute
There is the tolerance limit of electron current.Reduction can be also different.Here, lower limit can also reduce together, also that is, making not necessarily
Generate higher frequency.
It is therefore preferred that the tolerance limit and the total current of generation relatively change.Therefore, it can be realized in closed loop
Control the indirect feedback in the sense that (Regelung), but not direct closed-loop control each electric current accordingly.More precisely
It says, the feedback of total current is inputted via the variation of tolerance limit.It proposes according to one embodiment, the public affairs of each modulation method
The poor limit forms the tolerance range with tolerance limit and lower variation of tolerance, and tolerance limit and lower variation of tolerance become independently of one another
Change, or the mobile tolerance range in the case where keeping the constant space between lower variation of tolerance and tolerance limit.
The tolerance range for being each respectively used to generate the modulation method of an electron current in electron current has tolerance limit and public affairs
It poor lower limit and proposes thus, tolerance limit and lower variation of tolerance change independently of one another.Such as it can reduce tolerance when needed
The upper limit, without changing lower variation of tolerance or on the contrary.It proposes as an alternative, moves integrally tolerance range.It is especially real by mobile tolerance range
Existing, thus, it is possible to the amplitudes to each electron current to have an impact, without changing switching frequency.
Preferably, the tolerance limit of each modulation method of electron current is chosen to respectively or is thus changed to, so that total current
Within preset tolerance limit.It accordingly, is the total current pre-set tolerance limit or tolerance range.Under type such as is then passed through to realize
It keeps the tolerance limit: adjusting each tolerance limit of electron current.If total current reaches its tolerance limit (such as every
It is such case in the tolerance range method of a single current), then direct switch motion is not triggered, but indirectly via change
The tolerance limit of each electron current carries out opened loop control.
But the variation of each tolerance limit withouts waiting for total current and reaches its tolerance limit or reach tolerance range
Two tolerance limits in one.Instead of this or preferably, the spacing of total current and its tolerance limit has been able to cause
The variation of the tolerance limit of the modulation method of each electron current is especially moved.Furthermore or as an alternative, can also assess total current with most
The spacing of excellent change curve to be achieved, i.e. especially optimal sinusoidal variations curve, and change electron current in relation
Each modulation method tolerance limit.I.e. if for example total current is more than its optimal value, can reduce for electron current
The upper limit of modulation method.If total current is more than that its optimal value is farther, each modulation for reducing each electron current can continue to
The tolerance limit of method is tolerance limit in this example.Identical content certainly also can be the case where being lower than optimal value by meaning
Lower progress.
Preferably, in order to set tolerance limit, electron current and total current are measured.Therefore, each single modulation method conduct
Input terminal for measuring corresponding electron current also has the measured value of total current.It also shows herein, total current becomes as measurement
The modulation method very more to multiple, part is measured to input simultaneously.It is also avoided by the method for proposition: overreaction can occur,
It, can such as in the case where total current is excessive when whole modulation methods react suddenly and terminate each pulse just applied
The overreaction can occur.Preferably, the tolerance limit maximum of each modulation method is respectively moved to the optimal value of fundamental curve,
It is moved to optimal sinusoidal variations curve.The i.e. described optimal basic change curve be the tolerance range upper limit formed minimum value and
Maximum value is formed for tolerance lower limit.Thereby, it is possible to rapidly react to the total current of too great deviations, each electron current is still
It is moved about around its optimal value, i.e. in the sinusoidal variations curve to be set.
It proposes, electron current and total current is transformed in common coordinate system according to one embodiment, in the coordinate
The limit to be kept is preset in system, so that total current is located within tolerance limit or preset tolerance limit.Preferably, this change
Transducing is enough the transformation to rotating coordinate system.Therefore, more particularly to according to numerical value and phase preset measured value and optimal value and pole
Limit.Then, for optimal value, only change phase but do not change numerical value.Pole can be more simply defined in rotating coordinate system
Limit value.However, the measured value that must convert every time.
In this regard, this transformation also includes weighting electron current with different value.Therefore, described to be weighted to transformation and example
It can such as indicate, the tolerance limit for different electron currents differently relatively changes with total current.
If between each electron current, i.e. between each inverter occur compensation electric current, electron current it is this
Weighting is particularly advantageous.This compensation electric current especially can also generate in the following cases between each inverter: these
Inverter is also when input end side is electrically connected with same direct-flow input end.As long as this compensation electric current known, then the compensation
Electric current is included in together in relevant electron current respectively as component, but is not merged into total current together.Therefore, corresponding to survey
Amount, the electron current that also leads back for modulation method do not correspond to the electron current for being then actually included into total current.This can be in tolerance pole
Limit considers in the case where being corresponding affected on by weighting.It does not consider further that corresponding electron current then, but considers by means of described
The transformation of weighting.
According to the present invention, it is also proposed that for by the current fed feed-in equipment into power supply network.This feed-in equipment has
Multiple inverters, the inverter are respectively provided with electron current output end, wherein each electron current is produced in electron current output
Life provides there.
In addition, being equipped with summed current output end, the summed current output end sums it up electron current at total current, neutron
Current output terminal is connect at adduction node with summed current output end.For this purpose, currently proposed a kind of according to above embodiment
In an embodiment the method for generating electric current.Preferably, inverter parallel is connected and is exported in its electron current
Power grid choke coil is respectively provided at end.Preferably, it is provided only with power grid choke coil, without additional output filter.In particular,
Without using otherwise conventional L-C-L filter, but power grid inductance or power grid choke coil is used only.It is, in the method
In, this filter can be abandoned.By relatively changing tolerance range, the L-C-L filter of this otherwise routine with total current
It can be dispensable.Therefore the special smoothing or filtering of single current can be abandoned, the smoothing and filtering make
It obtains the single current and is fifty-fifty superimposed as total current as beneficial as possible, the total current is especially stretched as close to optimal value
Exhibition.
Preferably, L filter can be also referred to as by being only respectively present between each electron current output end and adduction node
Inductance or power grid inductance.In general, electron current output end is also constituted to three-phase, and as inductance then it is preferably provided that the electricity of three-phase
Net choke coil, in the power grid choke coil of the three-phase, such as by using the choke coil with 5 column cores, phase magnetic coupling.
Preferably, the additional power grid choke coil in summed current output can be also abandoned, because of the method proposed
The single current advantageously supplemented total current is caused.
Moreover, it is proposed that being equipped in each electron current output for measuring corresponding son electricity to set tolerance limit
The measuring mechanism of stream, and also the measuring mechanism for measuring total current is equipped in summed current output.Here, still will
The measuring mechanism of its measured value feedback to different inverters is enough.
In input end side and in addition to this it is proposed according to another embodiment, some in inverter or inverter or replace
Selection of land is in output end electrolysis coupling.The decoupling of input end side can for example indicate that the busbar connector or DC current for inputting end side draw
Line electrolysis coupling.For this purpose, for example, the generation of DC current has been able on generator, especially in use wind energy facility, electricity point
It is liftoff to be carried out in multiple systems and accordingly discretely guide each inverter into.
In output end, electrolysis coupling is also carried out on common transformer.One possibility is that transformer has difference
Tap.It then is the electrically separated sub- winding feed of common transformer.Node is summed it up instead of electricity, obtains magnetic adduction dress
It sets.Transformer is then able to form adduction node.This decoupling being capable of tolerance range adjustment relevant to entire electric current particularly well
Proposition method it is associated.Herein, particularly preferably generate single current, and accordingly can be superimposed as total current well.
Thus, it is possible to avoid compensation electric current.
According to the present invention, it is also proposed that a kind of wind energy facility, the wind energy facility prepare for generate and feed-in electric current and
It thus include the feed-in equipment according to an embodiment in embodiment described above.I.e. wind energy facility has multiple
Inverter, the inverter generate the total current for wind energy facility jointly to be fed into power supply network.
Detailed description of the invention
In the following, illustratively elaborating the present invention according to embodiment referring to attached drawing.
Fig. 1 shows the perspective view of wind energy facility.
Fig. 2 shows the schematic diagrames of the wiring of multiple inverters for generating total current.
Fig. 3 illustrates tolerance range method.
Fig. 4 shows the schematic construction for illustrating a part of closed-loop control method according to one embodiment.
Specific embodiment
Fig. 1 shows the wind energy facility 100 with tower 102 and gondola 104.Tool is provided on gondola 104, and there are three rotors
The rotor 106 of blade 108 and pod 110.Rotor 106 is placed in rotational motion by wind at runtime and then drives in gondola 104
Generator.
Line arrangement according to fig. 2 illustrates feed-in equipment 1 and three inverters 2, the inverter is shown here
Illustratively represent other inverters.In this regard, these three inverters 2 also generate electron current i1、i2And in.Inverter 2 is distinguished
With DC voltage input end 4, the DC voltage input end can also be referred to as DC input terminal.It is inverse via the DC input terminal 4
Become device 2 and obtains its input power.The DC input terminal 4 of inverter 2 is coupled via DC bus 6.But according to an embodiment party
Formula it is also proposed that: the DC input terminal 4 does not couple, but is connected respectively on the source DC 8 of itself.Fig. 2 shows two possibility
Property.The separating for the source DC 8 for enabling each DC input terminal 4 to have itself of DC input terminal 4 can for example be configured to, so that especially
The generator of its wind energy facility has supplied the separated source DC 8.
Now, inverter 2 generates corresponding output electric current i in its output1、i2Or in, the output end is referred to as
Electron current output end 10.The output end of each inverter also has outputting inductance 12.Show each in each outputting inductance downstream
Inverter 2 generates three-phase current.Therefore, it is also released from Fig. 2, in the method for proposition, at each electron current output end 10
The outputting inductance 12 can be enough.Otherwise conventional filter, especially L-C-L filter are not needed.Export electron current
i1、i2And inIt is superimposed at adduction node 14, that is, is added and is used as total current i at summed current output end 16GGuidance.Always
There is common power grid inductance 18 with current output terminal, the power grid inductance also can be still dispensable.Total current iG
It is then able to be fed into power supply network 22 via transformer 20.
Now, other working principles are illustrated about the considerations of electric current.Here, it is noted that not only in each inverter 2
Output electron current and also be three-phase there are also total output electric current at summed current output end 16.But into one
The elaboration of step only discusses the phase in the three-phase current respectively.Therefore, a phase is only observed, and remaining phase is in an identical manner
It works with method.
Now, visible in fig. 2, for each electron current i1、i2And inThere are current sensors 24.Equally, equipped with being used for
Total current iGCurrent sensor 26.
Now, measured value of each inverter 2 using its electron current, i.e. i1、i2Or in, and furthermore use total current iG
Measured value.That is total current iGIt flows in each inverter in inverter 2.Each inverter then with total current iGRelatively
The corresponding tolerance limit of corresponding tolerance range or tolerance range is set, and then relatively controls corresponding semiconductor with its electron current
Switch, to modulate corresponding electric current.
Therefore, then generating electric current i1、i2And in, the electric current is due to the type of its circuit and due to outputting inductance
12 states with beneficial, low oscillation and then the superposition at adduction node 14.Obtain total current iG, the measurement of the total current
Value leads back each inverter in inverter 2 as described.
Fig. 3 is that tolerance range method illustrates optimal sine curve 30, and existing around the sine curve has tolerance
Upper limit T1With lower variation of tolerance T2Tolerance range.In order to illustrate, the tolerance range is very broadly shown, and in practice certainly
It is much narrower.
The electric current i of generation1Positioned at limit T1And T2Between the tolerance range in, herein illustratively use the electric current.
Electric current is generated by following manner: being closed the switch for generating positive pulse.As long as applying the positive pulse, then
Electric current increases, and once the electric current reaches upper limit T1, then being again off corresponding switch and pulse termination.Electric current with
After decline, until reach lower limit T2, so that the switch mentioned then is closed again, simplifiedly intuitively to illustrate the mistake
Journey.
Now, Fig. 3 shows tolerance range, and in the tolerance range, optimal sine 30 is located at centre, i.e., away from upper and lower bound
T1Or T2Same big spacing.Now for example in order to consider high total current or resist high total current, upper limit T1It can be to moving down
It is dynamic, so that the upper limit is closer to optimal sine 30.Lower limit T2It equally can continue to move down or it remained unchanged.
In this movement of tolerance range, i.e. upper limit T1Exemplary description movement after, basic tolerance range method for
The electron current i being exemplarily illustrated in Fig. 31But unchangeably continue in other respects.Therefore, the method is also examined
Look into: whether the rising edge of electric current reaches tolerance limit T1, tolerance limit decline located elsewhere or electric current certainly now
Whether edge reaches lower variation of tolerance T2。
The method is shown in Fig. 4 with the structure of signal, and the structure illustrates or simplifiedly show feed-in equipment
41.Electron current i1Actual generation carried out in inverter 42, the inverter schematically shows among DC voltage herein
Circuit 44.There are two switch S for setting between the positive and negative nodes1And S2, the switch generation voltage pulse waveforms, so that
Electron current i at electron current output end 501Also depend on the generation of outputting inductance 52.The electron current i1With other several son electricity
Flow i2To inSum it up into total current iG.It can be total current iGEquipped with power grid inductance 58, the power grid inductance also can be still can
Having can nothing.
The total current iGIt is measured by total current measuring instrument 66 and inputs tolerance block 70.Tolerance block 70 be then able to
Total current relatively and with the tolerance limit T for total currentG1And TG2It relatively presets or changes and actual illustrated in Fig. 3
The tolerance limit T of explanation1With lower variation of tolerance T2.The tolerance limit and lower variation of tolerance T1And T2In being enter into control unit 72
In.Control unit 72 also obtains current electron current i1And then it works as described in Fig. 3.With electron current i1Passing through
Tolerance limit and lower variation of tolerance T1And T2The position in tolerance range provided relatively, then generates switching signal S, the switch
Signal is supplied to inverter 42.Inverter 42 then correspondingly switches switch S1And S2.Especially for positive pulse, switch S1Closure
And switch S2It disconnects, and positive pulse is terminated or for negative pulse, closure switch S2And disconnect switch S1。
Then there is electron current i1, the electron current is introduced back again with for next calculating.Also there is total current iGIt is new
Value, i.e., together with other electric currents i2To in, and equally by total current iGDescribed value lead back as described.
In the supplement of the description to the basic signal, can also be proposed especially in combination with Fig. 3 and 4, by the margin of tolerance,
Especially to total current iGThe defined margin of tolerance, the tolerance limit T illustrated in Fig. 4G1And TG2It is converted into suitable seat
Mark so as to preferably check maintenance by total current, and/or therefrom can preferably derive reaction, especially tolerance
Upper and lower bound T1And T2Variation.Correspondingly, propose that a kind of method, the method can be realized the public affairs for total current
The maintenance of poor range.
Therefore, observe following situation: multiple power electronic systems jointly, are i.e. transported with series circuit and/or parallel circuit
It goes and carrys out closed-loop control by means of approximate sliding mode controller independently of each other, the sliding mode controller can also be referred to as tolerance
Tape controller can include this tolerance tape controller.The sliding mode controller can for example be configured to hystersis controller.In
Be that usually can ensure: for each subsystem, the control deviation of slip function is maintained within specific tolerance range.
However, because can occur: the system of interconnection there is no the synchronization of the switch motion in subsystems
Control deviation while in same direction deviation, so that there is unfavorable superposition.For described problem, propose as described above
Solution.
In order to also targetedly influence the superposition of current or voltage ripple, in practice usually using following methods: institute
State method application pulsewidth modulation or space vector modulation.In the method, switching frequency is usually fixed, and is directed to
Property so that the switching time of system of interconnection is staggered, to realize the desired superposition of current or voltage ripple.
It is it is a disadvantage that the intrinsic advantage of sliding mode control apparatus must be abandoned in the solution, i.e., especially strong
Inhibit the characteristic specifically interfered.
It is also proposed that, the power electronic system of interconnection is run with approximate sliding formwork, so that ensuring defined public affairs as far as possible now
The maintenance of poor range.By properly selecting the margin of tolerance, it can avoid or be greatly reduced in the range of above description and is humorous
" the unfavorable superposition " of wave oscillation.
Claims (11)
1. a kind of method for generating alternating current, described method includes following steps:
Generate multiple electron current (i1, i2, in), and
By the electron current (i1, i2, in) it is superimposed as total current (iG) to form the alternating current, wherein
Each electron current (i is generated using modulation method1, i2, in), and
The modulation method, which uses, has tolerance limit (T1, T2) tolerance range method, and
Tolerance limit (the T1, T2) it is variable, wherein
With the total current (i of generationG) relatively change the tolerance limit, and
By the electron current (i1, i2, in) the modulation method the tolerance limit (T1, T2) be chosen to respectively, so that described
Total current (iG) it is located at preset tolerance limit (TG1,TG2) within.
2. the method according to claim 1, wherein the tolerance limit (T of each modulation method1, T2) shape
At with tolerance limit and lower variation of tolerance (T1, T2) tolerance range, and change under the tolerance limit and tolerance independently of one another
Limit (T1, T2), or keeping lower variation of tolerance and tolerance limit (T1, T2) between constant space in the case where the mobile public affairs
Difference band.
3. according to the method described in claim 2, it is characterized in that, in order to set the tolerance limit (T1, T2), described in measurement
Electron current (i1, i2, in) and the total current (iG)。
4. according to the method described in claim 2, it is characterized in that, by the electron current (i1, i2, in) and the total current (iG)
It is transformed into common coordinate system, the limit to be kept is preset in the coordinate system, so that the total current (iG) it is located at tolerance
The limit or the preset tolerance limit (TG1, TG2) within.
5. according to the method described in claim 4, it is characterized in that, the common coordinate system is rotating coordinate system.
6. one kind is for being fed into the feed-in equipment (Isosorbide-5-Nitrae 1) in power supply network (22) for alternating current, the feed-in equipment includes:
Multiple inverters (2), the inverter are respectively provided with electron current output end (10), and the inverter is respectively used in institute
State generation electron current (i at electron current output end (10)1, i2, in),
Summed current output end (16), the summed current output end are used for the electron current (i1, i2, in) sum it up into total electricity
Flow (iG) to form the alternating current, wherein the electron current output end (10) is electric with the summation at adduction node (14)
Output end (16) connection is flowed,
It will wherein be used to generate electric current according to the method for claim 1.
7. feed-in equipment (Isosorbide-5-Nitrae 1) according to claim 6, which is characterized in that the inverter (2) be connected in parallel and
Power grid choke coil (12) are respectively provided at its electron current output end (10).
8. feed-in equipment (Isosorbide-5-Nitrae 1) according to claim 6, which is characterized in that the inverter (2) is with defeated in its electric current
Power grid choke coil (12) is utilized respectively at outlet (10) to work without the mode of additional output filter and/or described
Mode at summed current output end (16) without additional power grid choke coil (18) works.
9. feed-in equipment (Isosorbide-5-Nitrae 1) according to claim 6, which is characterized in that in order to set the tolerance limit (T1,
T2), it is equipped at each electron current output end (10) for measuring the corresponding electron current (i1, i2, in) measuring mechanism,
And it is equipped at the summed current output end (16) for measuring the total current (iG) measuring mechanism.
10. feed-in equipment (Isosorbide-5-Nitrae 1) according to claim 6, which is characterized in that the inverter (2) or the inverter
In some inverters in input end side and/or in output end electrolysis coupling.
11. one kind is for generating electric current and current fed will arrive wind energy facility (100) in power supply network (22), the wind energy facility
With feed-in equipment (Isosorbide-5-Nitrae 1) according to claim 6.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014219052.5 | 2014-09-22 | ||
| DE102014219052.5A DE102014219052A1 (en) | 2014-09-22 | 2014-09-22 | Method for generating an alternating electrical current |
| PCT/EP2015/070536 WO2016045963A1 (en) | 2014-09-22 | 2015-09-09 | Method for generating an alternating electric current |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107112920A CN107112920A (en) | 2017-08-29 |
| CN107112920B true CN107112920B (en) | 2019-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201580051154.6A Active CN107112920B (en) | 2014-09-22 | 2015-09-09 | Method for generating alternating current |
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| Country | Link |
|---|---|
| US (1) | US20170284370A1 (en) |
| EP (1) | EP3198716A1 (en) |
| JP (1) | JP6438127B2 (en) |
| KR (1) | KR101970902B1 (en) |
| CN (1) | CN107112920B (en) |
| AR (1) | AR101990A1 (en) |
| AU (1) | AU2015321143A1 (en) |
| BR (1) | BR112017005627A2 (en) |
| CA (1) | CA2960434C (en) |
| DE (1) | DE102014219052A1 (en) |
| TW (1) | TWI605680B (en) |
| UY (1) | UY36317A (en) |
| WO (1) | WO2016045963A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102016107614A1 (en) | 2016-04-25 | 2017-10-26 | Wobben Properties Gmbh | Inverter and method for generating an alternating current |
| CA3034966C (en) * | 2016-09-23 | 2022-11-01 | Wobben Properties Gmbh | Method for generating an alternating current by means of an inverter of a wind turbine |
| DE102017101359A1 (en) * | 2017-01-25 | 2018-07-26 | Wobben Properties Gmbh | Method for feeding an alternating electrical current |
| DE102018100084A1 (en) | 2018-01-03 | 2019-07-04 | Wobben Properties Gmbh | Wind energy plant for feeding electrical power by means of a full converter |
| EP3930173A1 (en) | 2020-06-26 | 2021-12-29 | Wobben Properties GmbH | Method for controlling an inverter |
| EP3979484A1 (en) * | 2020-10-02 | 2022-04-06 | Wobben Properties GmbH | Method for controlling a wind energy system |
| EP3996270A1 (en) * | 2020-11-10 | 2022-05-11 | Wobben Properties GmbH | Control method for power converter |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP6438127B2 (en) | 2018-12-12 |
| DE102014219052A1 (en) | 2016-03-24 |
| US20170284370A1 (en) | 2017-10-05 |
| AR101990A1 (en) | 2017-01-25 |
| KR20170057365A (en) | 2017-05-24 |
| EP3198716A1 (en) | 2017-08-02 |
| CN107112920A (en) | 2017-08-29 |
| AU2015321143A1 (en) | 2017-03-23 |
| CA2960434C (en) | 2020-07-07 |
| CA2960434A1 (en) | 2016-03-31 |
| TW201630325A (en) | 2016-08-16 |
| JP2017528110A (en) | 2017-09-21 |
| KR101970902B1 (en) | 2019-04-19 |
| UY36317A (en) | 2016-04-29 |
| WO2016045963A1 (en) | 2016-03-31 |
| TWI605680B (en) | 2017-11-11 |
| BR112017005627A2 (en) | 2018-01-23 |
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